1973 Yamaha Enduro Tune-Up

Here is a step by step how-to-do-it for those of you who would like to check out your engine in case you are in doubt as to its state of tune. I've used an HT-1 90 enduro as an example here, but the same procedure is used on all Yamaha enduro models, with the exception of the AT1 125 electric start, and the 360 and 500 singles, which have an ignition advance mechanism...

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